133 lines
5.8 KiB
XML
133 lines
5.8 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="gluSphere">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>1991-2006</year>
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<holder>Silicon Graphics, Inc.</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>gluSphere</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>gluSphere</refname>
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<refpurpose>draw a sphere</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>gluSphere</function></funcdef>
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<paramdef>GLUquadric* <parameter>quad</parameter></paramdef>
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<paramdef>GLdouble <parameter>radius</parameter></paramdef>
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<paramdef>GLint <parameter>slices</parameter></paramdef>
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<paramdef>GLint <parameter>stacks</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>quad</parameter></term>
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<listitem>
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<para>
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Specifies the quadrics object (created with <citerefentry><refentrytitle>gluNewQuadric</refentrytitle></citerefentry>).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>radius</parameter></term>
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<listitem>
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<para>
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Specifies the radius of the sphere.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>slices</parameter></term>
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<listitem>
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<para>
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Specifies the number of subdivisions around the <emphasis>z</emphasis> axis
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(similar to lines of longitude).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>stacks</parameter></term>
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<listitem>
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<para>
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Specifies the number of subdivisions along the <emphasis>z</emphasis> axis
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(similar to lines of
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latitude).
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>gluSphere</function> draws a sphere of the given radius centered around the origin. The
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sphere is subdivided around the <emphasis>z</emphasis> axis into slices and along the
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<emphasis>z</emphasis> axis
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into stacks (similar to lines of longitude and latitude).
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</para>
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<para>
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If the orientation is set to <constant>GLU_OUTSIDE</constant>
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(with <citerefentry><refentrytitle>gluQuadricOrientation</refentrytitle></citerefentry>), then any normals generated
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point away from the center of the sphere.
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Otherwise, they point toward the center of the sphere.
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</para>
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<para>
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If texturing is turned on (with <citerefentry><refentrytitle>gluQuadricTexture</refentrytitle></citerefentry>), then texture
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coordinates are
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generated so that <emphasis>t</emphasis> ranges from 0.0 at
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<inlineequation><mml:math>
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<!-- eqn: z = -radius:-->
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<mml:mrow>
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<mml:mi mathvariant="italic">z</mml:mi>
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<mml:mo>=</mml:mo>
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<mml:mrow>
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<mml:mo>-</mml:mo>
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<mml:mi mathvariant="italic">radius</mml:mi>
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</mml:mrow>
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</mml:mrow>
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</mml:math></inlineequation>
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to 1.0 at
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<inlineequation><mml:math>
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<!-- eqn: z = radius:-->
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<mml:mrow>
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<mml:mi mathvariant="italic">z</mml:mi>
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<mml:mo>=</mml:mo>
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<mml:mi mathvariant="italic">radius</mml:mi>
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</mml:mrow>
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</mml:math></inlineequation>
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(<emphasis>t</emphasis> increases linearly along longitudinal
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lines),
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and <emphasis>s</emphasis> ranges from 0.0 at the +<emphasis>y</emphasis> axis, to 0.25 at the
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+<emphasis>x</emphasis> axis,
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to 0.5 at the \-<emphasis>y</emphasis> axis, to 0.75 at the \-<emphasis>x</emphasis> axis, and back to 1.0
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at the +<emphasis>y</emphasis> axis.
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>gluCylinder</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluDisk</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluNewQuadric</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluPartialDisk</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluQuadricOrientation</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>gluQuadricTexture</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 1991-2006
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Silicon Graphics, Inc. This document is licensed under the SGI
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Free Software B License. For details, see
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<ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
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</para>
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</refsect1>
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</refentry>
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